Atmospheric Chemistry and Physics Discussions
www.atmos-chem-phys-discuss.net
1680-7367
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7
2
2007
10.5194/acpd-7-3805-2007
http://www.atmos-chem-phys-discuss.net/7/3805/2007/
http://www.atmos-chem-phys-discuss.net/7/3805/2007/acpd-7-3805-2007.html
http://www.atmos-chem-phys-discuss.net/7/3805/2007/acpd-7-3805-2007.pdf
3805
3836
2007-03-15
Inferring thermodynamic properties from CCN activation experiments: a) single-component and binary aerosols
L. T. Padró
A. Asa-Awuku
R. Morrison
A. Nenes
nenes@eas.gatech.edu
School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA
School of Earth and Atmospheric Sciences, Georgia Institute of Technology Atlanta, GA, 30332, USA
now at: Department of Chemical Engineering, University of Texas, Austin, TX, 78712, USA
This study presents a new method, Köhler Theory Analysis (KTA), to infer
the molar volume and solubility of organic aerosol constituents. The method
is based on measurements of surface tension, chemical composition, and CCN
activity coupled with Köhler theory. KTA is evaluated by inferring the
molar volume of six known organics (four dicarboxylic acids, one amino acid,
and one sugar) in pure form and in mixtures with ammonium sulfate ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>).
Inferred molar volumes are to within 18% of their expected value for
organic fractions between 90 and 100%. This suggests that KTA is a
powerful and ideal method for determining the CCN characteristic of ambient
water soluble organic carbon (WSOC) and provide physically-based constraints
for aerosol-cloud interaction parameterizations.
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